<template>
  <el-container class="home-container">
  <!--  头部区域  -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--  页面主体区域  -->
    <el-container>
      <!--   侧边栏   -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--    侧边栏菜单区    -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath">
          <!--     一级菜单     -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!--     一级菜单的模板区域       -->
            <template slot="title">
              <!--      图标        -->
              <i :class="iconsObj[item.id]"></i>
              <!--       文本       -->
              <span>{{item.authName}}</span>
            </template>

            <!--     二级菜单       -->
            <el-menu-item
              :index="'/'+subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!--      图标        -->
                <i class="el-icon-menu"></i>
                <!--       文本       -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--   右侧内容主体   -->
      <el-main>
        <!--    路由占位符    -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    name: 'Home',
    data(){
      return{
      //  左侧菜单数据
        menulist:[],
        iconsObj:{
          '125':'iconfont icon-user',
          '103':'iconfont icon-tijikongjian',
          '101':'iconfont icon-shangpin',
          '102':'iconfont icon-danju',
          '145':'iconfont icon-baobiao'
        },
        // 是否折叠
        isCollapse:false,
        // 被激活的链接地址
        activePath:''
      }
    },
    created () {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods:{
      logout(){
        // 清空token
        window.sessionStorage.clear();
        // 跳转到登录页
        this.$router.push('/login');
      },
      // 获取所有的菜单
      async getMenuList(){
        const {data:res} = await this.$http.get('menus')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        // console.log(res)
      },
      //  点击按钮，切换菜单的折叠与展开
      toggleCollapse(){
        this.isCollapse =! this.isCollapse
      },
      //  保存链接的激活状态
      saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath
      }
    }
  }
</script>

<style lang="less" scoped>
  .home-container{
    height: 100%;
  }
  .el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    /* 使退出按钮不上下贴边，而是居中 */
    align-items: center;
    color: #fff;
    font-size: 20px;
    /* 设置左侧的样式 */
    > div{
      display: flex;
      /* 使文本居中对齐 */
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }
  .el-aside{
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }
  .el-main{
    background-color: #EAEDF1;
  }

  .iconfont{
    margin-right: 10px;
  }

  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
